Extruded material control structure of double-screw extruder

Abstract

The invention relates to an extruded material control structure of a double-screw extruder, and aims to solve the problems of unstable feeding, non-uniform material supply, inaccurate pressure control, material blockage in the feeding process and the like in the prior art. The structure comprises a control scheme for accurately adjusting the feeding speed to be matched with the rotating speed of an extrusion screw rod, and a feeding auger is matched with a sliding square rod to ensure that materials uniformly enter a charging barrel, so that the phenomenon of bias flow or material breakage is avoided; an introduced pressure rapid compensation mechanism can adjust the extrusion pressure in the charging barrel in real time, and it is ensured that the extrusion screw rod works under the optimal pressure; the anti-blocking feeding mechanism is matched with a sliding square rod through a wedge-shaped boss, so that material blocking is effectively avoided, and smooth conveying of materials is guaranteed; in addition, the design of the stirring motor and the rotary drum ensures that the materials are uniformly mixed, and the extrusion problem caused by non-uniform humidity and particles is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of extruders, and particularly to an extrusion material control structure for a twin-screw extruder. Background Art

[0002] As a common plastic processing equipment, extruders are widely used in industries such as chemical engineering, food, rubber, and medicine, and are mainly used for heating, plasticizing, and forming materials. Twin-screw extruders have become the core equipment in many high-demand production processes due to their high-efficiency material mixing and transmission capabilities.

[0003] In existing twin-screw extruders, although technology has been continuously developed and the control accuracy and stability have been improved, there are still some technical problems in practical applications. For example, during the feeding process, it is difficult to accurately control the conveying speed of the material. Especially when conditions such as the density and humidity of the material particles change, it is easy to occur unstable feeding, resulting in uneven material supply, which in turn affects the extrusion effect. This problem not only affects production efficiency but also may lead to unstable product quality or the appearance of waste materials.

[0004] At the same time, when existing extruders process different types of materials, it is often necessary to frequently adjust the parameters during the feeding and extrusion processes. However, most of the existing control structures cannot accurately and timely adjust the matching between the feeding speed and the rotation speed of the extrusion screw. Especially during large-scale production, it is difficult to ensure the uniformity and stability of the material during the feeding process. In addition, the internal pressure control of the extruder is also an important issue. Especially during the extrusion process of high-viscosity or heat-sensitive materials, how to maintain an appropriate pressure and avoid overpressure or underpressure phenomena is still a technical difficulty.

[0005] Therefore, how to accurately control the conveying and extrusion of materials on the premise of ensuring a stable feeding process, especially under efficient, stable, and adjustable extrusion conditions, has become an urgent technical problem in the industry. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides an extrusion material control structure for a twin-screw extruder. By precisely controlling the matching between the feeding speed of the material and the rotation speed of the extrusion screw, and combining a pressure compensation mechanism, it can adjust the internal pressure in real time, thereby effectively solving the problems of uneven feeding, unstable material supply, and inaccurate pressure control in the prior art.

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: An extrusion material control structure for a twin-screw extruder, comprising an extruder structure and a feeding mechanism. The extruder structure includes a machine base fixed on the ground surface. On one side of the upper surface of the machine base, there is a drive box. At the output end of the drive box, two rotating shaft cylinders are installed. On the surface of the rotating shaft cylinder, first chutes are symmetrically opened. In the front of the upper surface of the machine base, a barrel is fixed. Inside the barrel, two extrusion screws are symmetrically and rotatably installed. At the front end of the extrusion screw, there is a conical head. At the rear end of the extrusion screw, there is a docking square rod, and the rear end of the docking square rod is placed inside the rotating shaft cylinder; At the front side of the drive box, a pressure rapid compensation mechanism is installed. The pressure rapid compensation mechanism synchronously adjusts the axial positions of the two extrusion screws, and the pressure rapid compensation mechanism is used to rapidly adjust the extrusion pressure at the front end inside the barrel; The pressure rapid compensation mechanism includes a convex block fixed on the upper surface of the machine base and a control hydraulic cylinder fixed on the top of the drive box. The convex block is placed between the barrel and the drive box. Above the surface of the convex block, a control swing plate is rotatably installed. At the top of the control swing plate, a swing round rod is fixed. At the output end of the control hydraulic cylinder, a power push rod is slidably installed forward. The top of the swing round rod is installed at the end of the power push rod through a spherical bearing. A connecting sliding sleeve is sleeved on the surface of the rotating shaft cylinder. Symmetrically threaded through the surface of the connecting sliding sleeve are locking bolts. The locking bolts penetrate the first chutes, and the ends of the locking bolts are threaded onto the docking square rod. The control swing plate synchronously controls the two connecting sliding sleeves; The feeding mechanism includes a temporary storage barrel fixed at the rear side of the top of the barrel and a feed box placed on one side of the machine base. The bottom of the temporary storage barrel communicates with the inside of the barrel, and an anti-blocking feeding mechanism is installed inside the temporary storage barrel; The anti-blocking feeding mechanism is used to dredge the blockage of materials during the feeding process.

[0008] Further, an I-shaped sleeve is provided at the rear end of the connecting sliding sleeve. A connecting plate is also placed between the two connecting sliding sleeves. At both ends of the connecting plate, U-shaped plates are symmetrically provided. The U-shaped plates are open on the outside, and the two U-shaped plates are respectively stuck inside the two I-shaped sleeves.

[0009] Further, arc-shaped pressing blocks are symmetrically provided on both sides of the connecting plate. A track groove is opened on the surface of the control swing plate. The connecting plate is placed inside the track groove, and the arc-shaped pressing blocks are in contact with the inner wall of the track groove.

[0010] Further, a die head is installed at the front end of the barrel, and a filter screen is installed inside the die head.

[0011] Further, a screw conveyor is obliquely fixed between the temporary storage barrel and the feed box. The screw conveyor is used to convey the materials inside the feed box to the inside of the temporary storage barrel, A semi-sealed cover plate is installed on the top of the temporary storage barrel, a stirring motor is fixed at the center of the upper surface of the semi-sealed cover plate, a rotating drum is installed downward at the output end of the stirring motor, and stirring rods are evenly arranged on the surface of the rotating drum.

[0012] Furthermore, the anti-blocking feeding mechanism includes a semi-sealed cover plate having wedge-shaped bosses symmetrically arranged on the lower surface and a sliding square rod sliding inside the rotating drum, the sliding square rod protruding from the lower end surface of the rotating drum, a loading auger arranged at the bottom of the sliding square rod, and the loading auger placed between the temporary storage barrel and the barrel.

[0013] Furthermore, a second slide groove is symmetrically opened above the surface of the rotating drum, a limit plate is arranged on the surface of the rotating drum, the limit plate is placed below the second slide groove, and extension rods are symmetrically and laterally arranged on both sides of the top of the sliding square rod, and the extension rods pass through the second slide groove.

[0014] Furthermore, an extrusion rod is vertically arranged above the end of the extension rod, and the tops of the two extrusion rods are respectively in contact with the wedge-shaped bosses. A spring is sleeved on the surface of the rotating drum, and the spring is placed between the extension rod and the limit plate.

[0015] The present invention provides an extrusion material control structure of a twin-screw extruder, which has the following beneficial effects: First, by accurately controlling the matching of the material feeding speed and the extrusion screw speed, the present invention can effectively solve the problems of unstable feeding and uneven material supply in traditional extruders. In the prior art, since the feeding speed cannot be accurately adjusted, the material is uneven during the feeding process, which affects the extrusion effect. The present invention is designed to ensure that the material can evenly enter the barrel 12 through the cooperation of the feeding auger and the sliding square rod, thereby avoiding the phenomenon of biased flow or material breakage, and improving the stability and uniformity of the material during the extrusion process.

[0016] Secondly, the introduction of the rapid pressure compensation mechanism solves the problem in the prior art that the extruder cannot be quickly adjusted when the pressure fluctuates. Traditional extruders often have the problem of inaccurate extrusion pressure control, especially in the processing of high-viscosity or heat-sensitive materials, which are prone to insufficient or excessive pressure. By controlling components such as hydraulic cylinders, swing rods, and power push rods, the internal pressure can be quickly compensated and adjusted during the material extrusion process, ensuring that the extrusion screw 17 can always operate at a suitable pressure, thereby improving the extrusion effect of the material and reducing instability in production.

[0017] In addition, the design of the anti-blocking feeding mechanism helps to solve the problem of material blockage during the feeding process. Due to factors such as the size and humidity of the material particles, material blockage or poor conveying is prone to occur in traditional feeding mechanisms, affecting production efficiency. The present invention sets an anti-blocking feeding mechanism and utilizes the interaction between the wedge-shaped boss and the sliding square rod to avoid material blockage between the temporary storage barrel 31 and the barrel 12, thereby ensuring smooth material conveying and improving feeding efficiency and stability.

[0018] The design of the present invention also effectively avoids the extrusion problem caused by material humidity, uneven particles, etc. The design of the semi-sealed cover plate, the stirring motor and the rotating drum ensures that the material is fully mixed in the temporary storage barrel 31, avoiding uneven extrusion or blockage caused by uneven composition of the material. In addition, the combination of the stirring motor and the rotating drum enables the material to be fully mixed during the feeding process, further ensuring the uniformity of the material.

[0019] Through the above design, the present invention not only solves multiple technical problems in the prior art, but also ensures the stability and efficiency of the entire extrusion process by finely controlling the parameters of each link. Compared with the traditional twin-screw extruder, the extrusion material control structure of the present invention significantly improves the accuracy of material transportation, the stability of the extrusion process and the overall production efficiency, and has a wide range of application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the installation three-dimensional structure of the present invention; Figure 2 It is a right side cross-sectional structural schematic diagram of the present invention; Figure 3 For the present invention Figure 2 A schematic diagram of the front view structure of Figure 4 It is a schematic diagram of the cross-sectional structure of the feeding mechanism of the present invention; Figure 5 This is a schematic diagram of the installation structure of the pressure quick compensation mechanism of the present invention; Figure 6 It is a schematic diagram of the installation structure of the extrusion screw and the pressure compensation mechanism of the present invention; Figure 7 It is a schematic diagram of the installation structure of the sliding sleeve and the linkage plate of the present invention; Figure 8 It is a schematic diagram of the installation structure of the sealing cover plate and the feeding auger of the present invention; Figure 9 It is a schematic diagram of the installation structure of the rotating drum and the feeding auger of the present invention.

[0021] Among them, 1. Extruder structure; 11. Machine base; 12. Barrel; 13. Die head; 14. Filter screen; 15. Drive box; 16. Rotating shaft cylinder; 161. First chute; 17. Extrusion screw; 171. Tapered head; 172. Docking square rod; 2. Pressure rapid compensation mechanism; 21. Control hydraulic cylinder; 211. Power push rod; 22. Bump; 23. Control swing plate; 231. Swing round rod; 24. Track groove; 25. Connecting sliding sleeve; 251. Locking bolt; 26. I-shaped sleeve; 27. Linking plate; 271. Arc-shaped extrusion block; 28. U-shaped plate; 3. Feeding mechanism; 31. Temporary storage barrel; 32. Semi-sealed cover plate; 33. Feed box; 34. Screw feeder; 35. Stirring motor; 36. Rotating cylinder; 37. Stirring rod; 38. Second chute; 39. Limiting plate; 4. Anti-blocking feeding mechanism; 41. Wedge-shaped boss; 42. Sliding square rod; 43. Feeding auger; 44. Extension rod; 45. Extrusion rod; 46. Spring. Specific implementation mode

[0022] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0023] Embodiment 1: Refer to Figure 1-9 , an extrusion material control structure of a twin-screw extruder, including an extruder structure 1 and a feeding mechanism 3. The extruder structure 1 includes a machine base 11 fixed on the ground. One side of the upper surface of the machine base 11 is provided with a drive box 15. The output end of the drive box 15 is installed with two rotating shaft cylinders 16. The surface of the rotating shaft cylinder 16 is symmetrically provided with first chutes 161. The front side of the upper surface of the machine base 11 is fixed with a barrel 12. Inside the barrel 12, two extrusion screws 17 are symmetrically and rotatably installed. The front end of the extrusion screw 17 is provided with a tapered head 171, and the rear end of the extrusion screw 17 is provided with a docking square rod 172. The rear end of the docking square rod 172 is placed inside the rotating shaft cylinder 16; the extrusion screw 17 is made of high-strength alloy steel to ensure its durability and stability in high-temperature and high-pressure environments. The extrusion screw 17 is designed with a spiral structure, effectively improving the material transmission efficiency and ensuring uniform heating and plasticization of the material, and is suitable for extrusion processing of a variety of different materials.

[0024] A pressure rapid compensation mechanism 2 is installed on the front side of the drive box 15. The pressure rapid compensation mechanism 2 synchronously adjusts the axial positions of the two extrusion screws 17. The pressure rapid compensation mechanism 2 is used to quickly adjust the extrusion pressure at the front end inside the barrel 12. The design of the pressure compensation system adopts a high-pressure hydraulic system, ensuring that even during mass production, the extrusion pressure can still be precisely controlled, avoiding material quality fluctuations caused by pressure fluctuations. This pressure compensation mechanism 2 can achieve efficient and rapid response and automatic adjustment, ensuring the stable flow of materials throughout the extrusion process.

[0025] The pressure rapid compensation mechanism 2 includes a convex block 22 fixed on the upper surface of the machine base 11 and a control hydraulic cylinder 21 fixed on the top of the drive box 15. The convex block 22 is placed between the barrel 12 and the drive box 15. A control swing plate 23 is rotatably installed above the surface of the convex block 22. A swing round rod 231 is fixed on the top of the control swing plate 23. A power push rod 211 is slidably installed forward at the output end of the control hydraulic cylinder 21. The top of the swing round rod 231 is installed at the end of the power push rod 211 through a spherical bearing. A connecting sliding sleeve 25 is sleeved on the surface of the rotating shaft cylinder 16. Symmetrically threaded through the surface of the connecting sliding sleeve 25 are locking bolts 251. The locking bolts 251 penetrate the first sliding groove 161, and the ends of the locking bolts 251 are threaded onto the docking square rod 172. The control swing plate 23 synchronously controls the two connecting sliding sleeves 25. Through this structure, it can be ensured that the extrusion screws 17 can be precisely aligned in any state, maintaining the stable transportation and uniform heating of materials.

[0026] The feeding mechanism 3 includes a temporary storage barrel 31 fixed on the rear side of the top of the barrel 12 and a feed box 33 placed on one side of the machine base 11. The bottom of the temporary storage barrel 31 communicates with the inside of the barrel 12. An anti-blocking feeding mechanism 4 is installed inside the temporary storage barrel 31. The anti-blocking feeding mechanism 4 is used to dredge and block materials during the feeding process, preventing the interruption of material transportation caused by uneven particle sizes or humidity differences of materials. The temporary storage barrel 31 is made of a high-wear-resistant alloy material, ensuring the structural stability during long-term use. The feed box 33 is designed with anti-static materials, reducing the static electricity problems that may be caused during material transportation, thereby ensuring the stability of the feeding process.

[0027] The anti-blocking feeding mechanism 4 includes wedge-shaped bosses 41 symmetrically arranged on the lower surface of the semi-sealed cover plate 32 and sliding square rods 42 sliding inside the rotating cylinder 36. The sliding square rods 42 extend beyond the lower end surface of the rotating cylinder 36. A feeding auger 43 is arranged at the bottom of the sliding square rods 42. The feeding auger 43 is placed between the temporary storage barrel 31 and the barrel 12. The feeding auger 43 is made of high-wear-resistant steel, ensuring no wear under high-frequency use and ensuring the smoothness of material feeding. By setting the feeding auger 43, the feeding speed of materials can be precisely controlled, ensuring the matching of the feeding amount and the rotation speed of the extrusion screw 17, thereby improving the extrusion efficiency and product quality.

[0028] Refer toFigure 5-9 , an I-shaped sleeve 26 is arranged at the rear end of the connecting sleeve 25, a linkage plate 27 is placed between the two connecting sleeves 25, and U-shaped plates 28 are symmetrically arranged at both ends of the linkage plate 27, the outer side of the U-shaped plate 28 is open, and the two U-shaped plates 28 are respectively stuck in the inner side of the two I-shaped sleeves 26. This design can effectively enhance the stability of the structure and ensure that the connecting sleeve 25 does not deviate during the movement process, avoiding unevenness in material transportation.

[0029] See also Figure 5-7 , arc-shaped extrusion blocks 271 are symmetrically arranged on both sides of the linkage plate 27, a track groove 24 is opened on the surface of the control swing plate 23, the linkage plate 27 is placed inside the track groove 24, and the arc-shaped extrusion blocks 271 are in contact with the inner wall of the track groove 24. This design enhances the guiding property of the linkage plate 27, helps to accurately control the flow of materials during the extrusion process, and avoids material accumulation or uneven flow.

[0030] See also Figure 1-3 The front end of the barrel 12 is provided with a die head 13, and a filter screen 14 is provided inside the die head 13. The filter screen 14 is made of stainless steel, which has the advantages of high temperature resistance and corrosion resistance, and can filter out impurities during the material extrusion process to ensure the purity and quality of the extruded material.

[0031] See also Figure 1-4 A screw feeder 34 is also obliquely fixed between the temporary storage barrel 31 and the material box 33. The screw feeder 34 is used to transport the material in the material box 33 to the temporary storage barrel 31. A semi-sealed cover plate 32 is installed on the top of the temporary storage barrel 31. A stirring motor 35 is fixed at the center of the upper surface of the semi-sealed cover plate 32. A rotating drum 36 is installed downward at the output end of the stirring motor 35, and stirring rods 37 are evenly arranged on the surface of the rotating drum 36. The stirring motor 35 adopts a high-efficiency motor, which can quickly stir the material to ensure that the material is evenly mixed before entering the temporary storage barrel 31, thereby avoiding extrusion problems caused by uneven material composition.

[0032] See also Figure 4-9 The anti-blocking feeding mechanism 4 includes a wedge-shaped boss 41 symmetrically arranged on the lower surface of the semi-sealed cover plate 32 and a sliding square rod 42 sliding inside the drum 36. The sliding square rod 42 exceeds the lower end surface of the drum 36. A feeding auger 43 is arranged at the bottom of the sliding square rod 42. The feeding auger 43 is placed between the temporary storage barrel 31 and the barrel 12. This structure ensures the continuity and smoothness of the material during the feeding process through the cooperation of the sliding square rod 42 and the wedge-shaped boss 41, avoiding production interruption caused by uneven feeding or blockage.

[0033] See also Figure 8-9, symmetric second chutes 38 are provided above the surface of the rotary drum 36. A limiting plate 39 is provided on the surface of the rotary drum 36, and the limiting plate 39 is placed below the second chute 38. On both sides of the top of the sliding square rod 42, extension rods 44 are symmetrically and horizontally arranged. The extension rods 44 penetrate through the second chute 38; the extension rods 44 are made of stainless steel, with good corrosion resistance and fatigue resistance, ensuring their stability and durability during long-term use.

[0034] Refer to Figure 8-9 , a pressing rod 45 is vertically arranged above the end of the extension rod 44. The tops of the two pressing rods 45 are respectively in contact with the wedge-shaped boss 41. A spring 46 is sleeved on the surface of the rotary drum 36, and the spring 46 is placed between the extension rod 44 and the limiting plate 39. The spring 46 is made of high-elastic steel, which can provide sufficient upward thrust during feeding, ensuring that the pressing rod 45 is always in contact with the wedge-shaped boss 41, thereby maintaining the stability and uniformity of the feeding process.

[0035] Example 2: Matching control of feeding stability and extrusion screw speed Background: In the prior art, the matching of the feeding speed and the extrusion screw speed is inaccurate, resulting in unevenness of the material during feeding and affecting the extrusion effect. In this example, by using the cooperation of the feeding auger and the sliding square rod, the feeding stability is ensured, and the matching of the feeding speed and the extrusion screw speed is accurately controlled.

[0036] Working principle: In this example, the sliding square rod 42, through its cooperation with the feeding auger 43, ensures that the material particles can enter the barrel 12 stably and evenly. The feeding auger 43 is made of high-wear-resistant steel, with excellent corrosion resistance, ensuring efficient conveying and precise control during the feeding process.

[0037] Experimental data:

[0038] Comparative experiment: Compared with the traditional control system, the experimental results show that when the control scheme of the present invention is adopted, the matching of the feeding speed and the screw speed is more accurate, and the uniformity and output quality of the material are significantly improved.

[0039] Example 3: Pressure rapid compensation control Background: In the prior art, the extrusion pressure cannot be adjusted in real time, resulting in insufficient or excessive pressure and affecting the extrusion effect. In this example, a pressure rapid compensation mechanism is adopted, and the extrusion pressure is adjusted in real time through a hydraulic system to ensure the stability of material extrusion.

[0040] Working principle: By controlling the combination of the hydraulic cylinder 21 and the power push rod 211, the swinging round rod 231 is driven to drive the two connecting sliding sleeves 25 to move synchronously, thereby adjusting the axial positions of the two extrusion screws 17 and quickly compensating the internal pressure. This process can precisely adjust the pressure at the front end inside the barrel 12 to ensure consistency in high-viscosity materials and conventional materials.

[0041] Experimental data:

[0042] Comparative experiment: Through comparative tests, the extruder with rapid pressure compensation control has significant advantages during the extrusion of high-viscosity materials. Pressure regulation can avoid extrusion instability caused by pressure fluctuations and ensure high-quality output of materials throughout the extrusion process.

[0043] Example 4: Anti-blocking feeding mechanism Background: During the feeding process, uneven humidity and size of material particles may cause material blockage, affecting the stable transportation of materials. This example designs an anti-blocking feeding mechanism. Through the cooperation of the wedge-shaped convex platform and the sliding square rod, it ensures that the material does not get blocked and maintains a smooth feeding process.

[0044] Working principle: When blockage occurs during the feeding process, the relative movement between the wedge-shaped convex platform 41 and the sliding square rod 42 can effectively clear the blockage, avoid blockage between the temporary storage barrel 31 and the barrel 12, and ensure the stable transportation of materials. This design not only reduces equipment failures but also improves production efficiency.

[0045] Experimental data:

[0046] Comparative experiment: By comparing with traditional feeding systems, the anti-blocking feeding mechanism of the present invention significantly reduces blockage problems during the feeding process. Even in materials with relatively high humidity, the fluidity of the materials is effectively guaranteed, ensuring the stability of feeding.

[0047] Example 5: Design of the stirring motor and the rotating drum Background: During the material feeding process, due to the non-uniformity of the material composition, the extrusion quality may be unstable. In this example, through the combination of the stirring motor and the rotating drum, it is ensured that the materials are fully mixed before feeding, avoiding extrusion problems caused by uneven materials.

[0048] Working principle: The combination of the stirring motor 35 and the rotating drum 36 enables the materials to be fully stirred before entering the temporary storage barrel 31. The rotating drum 36 is evenly provided with stirring rods 37 on its surface. These stirring rods can ensure the uniform distribution of particles in the materials during rotation, avoiding unstable extrusion quality caused by uneven material composition.

[0049] Experimental data:

[0050] Comparative experiment: Compared with the traditional non-stirring feeding method, the combination of the stirring motor and the rotating drum in the present invention can complete the uniform stirring of materials in a shorter time, significantly improve the quality of the extruded materials, and reduce the production instability caused by uneven material composition.

[0051] Through the above embodiments, it can be seen that the various technical solutions of the present invention have significant advantages in solving the problems in the prior art, can greatly improve the material stability, feeding accuracy and production efficiency in the extrusion process, and show good performance under various experimental conditions.

[0052] 1. Judgment criteria for material uniformity Material uniformity refers to whether the material components (such as particles, viscosity, humidity, etc.) are evenly distributed during the feeding, mixing and extrusion processes of the material, which in turn affects the quality of the extruded product. The uniformity is evaluated according to the following criteria: Level 1: There are obvious particles or uneven components in the material, resulting in material breakage or uneven flow during the extrusion process, and the product quality is unstable.

[0053] Level 2: The material uniformity is poor, the particles or components are unevenly distributed, and intermittent material supply instability occurs during the extrusion process, affecting the product quality.

[0054] Level 3: The material uniformity is average, the distribution of particles and components is relatively uniform, but occasional slight particle aggregation or unevenness occurs, and the extrusion effect fluctuates.

[0055] Level 4: The material uniformity is good, the component distribution is basically uniform, and there are occasional weak fluctuations during the extrusion process, but it has little impact on the overall production.

[0056] Level 5: The material uniformity is very good, the particles and components are evenly distributed, the extrusion process is stable, and the product quality has high consistency.

[0057] 2. Judgment criteria for feeding stability Feeding stability refers to whether the material is continuously and evenly transported during the entire feeding process, and whether there are jams, blockages or fluctuations, which in turn affect the entire production process. The evaluation criteria for feeding stability are as follows: Level 1: The feeding process is unstable, the material often gets stuck or blocked, resulting in interrupted feeding or intermittent feeding, seriously affecting the production progress and material quality.

[0058] Level 2: The feeding process is relatively unstable, with occasional jams or blockages, which may affect the continuous supply of materials, resulting in minor production interruptions or uneven materials.

[0059] Level 3: There are certain fluctuations in the feeding process, with occasional material accumulation or uneven flow. Overall, it does not affect the production process, but it will have an impact on product quality.

[0060] Level 4: The feeding process is stable, with occasional minor fluctuations in material flow, but it does not affect the continuity of feeding and product quality, and the production process is basically smooth.

[0061] Level 5: The feeding process is very stable, with smooth material flow, continuous and uniform feeding, no jams or blockages, high production efficiency and consistent product quality.

[0062] Combined with the standards in the data table of the embodiments: Application of the judgment criteria for material uniformity and feeding stability in the experimental data table:

[0063] Annotation: In Group 1, the material uniformity is 4, indicating that the material composition is relatively uniform, with occasional minor fluctuations during the extrusion process, and the production process is relatively stable; the feeding stability is 3, meaning that there are occasional fluctuations or minor jams during feeding, but the overall impact on the production process is small.

[0064] In Groups 2 and 3, both the uniformity and stability are at a relatively high level, with good material quality and production stability, reaching Level 5 and Level 4 respectively, proving that the present invention can provide very stable feeding and high-quality material output under the conditions of this group.

[0065] Working principle: When in use, first pour the material particles into the interior of the feed hopper 33, then convey the material particles to the interior of the temporary storage barrel 31 through the screw feeder 34. The material flows into the interior of the barrel 12 through the temporary storage barrel 31, and then drives the extrusion screw 17 to rotate through the drive box 15, and heats through the barrel 12, so that the material particles melt and flow forward. After passing through the filter screen 14, it is extruded and formed through the die head 13. When feeding, start the stirring motor 35 to drive the rotating cylinder 36 to rotate, and then stir and mix the material in the temporary storage barrel 31 through the stirring rod 37. At the same time, it can drive the sliding square rod 42 to rotate, and convey the material particles to the interior of the barrel 12 through the feeding auger 43 to ensure stable feeding, thereby accurately controlling the feeding speed, making the feeding speed match the rotation speed of the extrusion screw 17 to stably control the extrusion volume.

[0066] Meanwhile, due to the existence of the spring 46, the extension rod 44 always has an upward force, which in turn causes the top of the extrusion rod 45 to always be in close contact with the wedge-shaped boss 41. Therefore, when the spring 46 rotates, the extrusion rod 45 will move along the trajectory of the wedge-shaped boss 41. As a result, the sliding square rod 42 will move up and down to drive the feeding auger 43 to make a slight axial movement during rotation when feeding materials, so as to ensure that the materials can be evenly added into the barrel 12 and avoid the phenomena of uneven flow or material breakage.

[0067] During the extrusion process, when the internal pressure is insufficient, the pressure quick compensation mechanism 2 can be used to control the two extrusion screws 17 to move forward to extrude the molten material in the front of the barrel 12, so as to quickly supplement the internal pressure. On the contrary, the pressure can be quickly reduced, so as to control the extruded material by controlling the pressure. When controlling, the hydraulic cylinder 21 is controlled to drive the power push rod 211 to move back and forth, and then drive the swing round rod 231 to swing. When controlling the swing plate 23 to swing, the connecting plate 27 is pushed to move back and forth through the track groove 24, and then the U-shaped plate 28 and the I-shaped sleeve 26 cooperate to drive the two connecting sliding sleeves 25 to move axially synchronously. Since the connecting sliding sleeve 25 and the docking square rod 172 are locked and fixed by the locking bolt 251, the extrusion screw 17 can be driven to move axially when the connecting sliding sleeve 25 moves axially, so as to perform synchronous control. The extruded material is controlled by controlling the hydraulic cylinder 21 and matching with the rotation speed of the extrusion screw 17 to achieve rapid adjustment during extrusion.

[0068] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An extrusion material control structure of a twin-screw extruder, comprising an extruder structure (1) and a feeding mechanism (3), characterized in that: The extruder structure (1) comprises a machine base (11) fixed on the ground, a drive box (15) is arranged on one side of the upper surface of the machine base (11), two rotating shaft barrels (16) are installed at the output end of the drive box (15), and the surface of the rotating shaft barrel (16) is symmetrically provided with a first slide groove (161), a barrel (12) is fixed on the front side of the upper surface of the machine base (11), and an extrusion screw (17) is symmetrically rotatably installed inside the barrel (12); A pressure quick compensation mechanism (2) is installed on the front side of the drive box (15), and the pressure quick compensation mechanism (2) synchronously adjusts the axial positions of the two extrusion screws (17). The pressure quick compensation mechanism (2) is used to quickly adjust the extrusion pressure at the front end of the barrel (12); The feeding mechanism (3) comprises a temporary storage barrel (31) fixed to the rear side of the top of the barrel (12) and a material box (33) placed on one side of the machine base (11); the bottom of the temporary storage barrel (31) is connected to the inside of the barrel (12); and an anti-blocking feeding mechanism (4) is installed inside the temporary storage barrel (31); The anti-blocking feeding mechanism (4) is used to clear blockages in materials during the feeding process.

2. The extrusion material control structure of a twin-screw extruder according to claim 1, characterized in that: The front end of the extrusion screw (17) is provided with a cone head (171), the rear end of the extrusion screw (17) is provided with a docking square rod (172), the rear end of the docking square rod (172) is placed inside the rotating shaft barrel (16), the pressure quick compensation mechanism (2) comprises a convex block (22) fixed on the upper surface of the machine base (11) and a control hydraulic cylinder (21) fixed on the top of the drive box (15), the convex block (22) is placed between the barrel (12) and the drive box (15), a control swing plate (23) is rotatably mounted above the surface of the convex block (22), and a swing plate (23) is fixed on the top of the control swing plate (23). A round rod (231), the output end of the control hydraulic cylinder (21) is slidably mounted with a power push rod (211) forwardly, the top of the swing round rod (231) is mounted on the end of the power push rod (211) through a joint bearing, the surface of the rotating shaft cylinder (16) is sleeved with a connecting sleeve (25), the surface of the connecting sleeve (25) is symmetrically screwed with a locking bolt (251), the locking bolt (251) passes through the first slide groove (161), the end of the locking bolt (251) is screwed on the docking square rod (172), and the control swing plate (23) synchronously controls the two connecting sleeves (25); An I-shaped sleeve (26) is arranged at the rear end of the connecting sleeve (25), a linkage plate (27) is placed between the two connecting sleeves (25), U-shaped plates (28) are symmetrically arranged at both ends of the linkage plate (27), the outer side of the U-shaped plate (28) is open, and the two U-shaped plates (28) are respectively clamped on the inner sides of the two I-shaped sleeves (26).

3. The extrusion material control structure of a twin-screw extruder according to claim 2, characterized in that: Arc-shaped extrusion blocks (271) are symmetrically arranged on both sides of the linkage plate (27), a track groove (24) is provided on the surface of the control swing plate (23), the linkage plate (27) is placed inside the track groove (24), and the arc-shaped extrusion blocks (271) are in contact with the inner wall of the track groove (24).

4. The extrusion material control structure of a twin-screw extruder according to claim 1, characterized in that: A die head (13) is installed at the front end of the barrel (12), and a filter screen (14) is installed inside the die head (13).

5. The extrusion material control structure of a twin-screw extruder according to claim 1, characterized in that: A screw feeder (34) is also obliquely fixed between the temporary storage barrel (31) and the material box (33), and the screw feeder (34) is used to transport the material inside the material box (33) to the inside of the temporary storage barrel (31). A semi-sealed cover plate (32) is installed on the top of the temporary storage barrel (31), a stirring motor (35) is fixed at the center of the upper surface of the semi-sealed cover plate (32), a rotating drum (36) is installed downward at the output end of the stirring motor (35), and stirring rods (37) are evenly arranged on the surface of the rotating drum (36).

6. The extrusion material control structure of a twin-screw extruder according to claim 4, characterized in that: The anti-blocking feeding mechanism (4) comprises a wedge-shaped boss (41) symmetrically arranged on the lower surface of the semi-sealed cover plate (32) and a sliding square rod (42) sliding inside the rotating drum (36), the sliding square rod (42) protruding from the lower end surface of the rotating drum (36), and a feeding auger (43) arranged at the bottom of the sliding square rod (42), the feeding auger (43) being placed between the temporary storage barrel (31) and the barrel (12).

7. The extrusion material control structure of a twin-screw extruder according to claim 6, characterized in that: A second slide groove (38) is symmetrically provided above the surface of the rotating drum (36), a limit plate (39) is provided on the surface of the rotating drum (36), and the limit plate (39) is placed below the second slide groove (38). Extension rods (44) are symmetrically and laterally provided on both sides of the top of the sliding square rod (42), and the extension rods (44) pass through the second slide groove (38).

8. The extrusion material control structure of a twin-screw extruder according to claim 7, characterized in that: An extrusion rod (45) is vertically arranged above the end of the extension rod (44), and the tops of the two extrusion rods (45) are respectively in contact with the wedge-shaped bosses (41). A spring (46) is sleeved on the surface of the rotating cylinder (36), and the spring (46) is placed between the extension rod (44) and the limiting plate (39).

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